Let’s do some 150m repeats after your easy runs. 3-4 of them once or twice a week. These should be at least sub 4:00 pace so a harder effort than your regular strides.
Once you’ve done that for a week or two, progress to having a 200m repeat session with the goal of running 29 or faster for each rep. Ideally you’ll be able to hit 6-8 reps of this with moderate rest (2-3 minutes).
After you’ve done that for a bit, move up to 300m repeats shooting for 43-44 per rep, with 4-6 reps in a workout. Take the rest you need to take to hit those splits. This progression should happen close to when racing starts. Maybe a week or two out.
In season vary these workouts
2-3x(400-200-200) shoot for sub 65 on the 400s and sub 28 on the 200s. Take 2 minutes between reps and full rest between sets.
2x(200-300-400-300-200) don’t worry much about splits on this one. Ideally it’ll be about 800m race pace but as long as you feel a bit of a lactic tie up starting at the 400m of every set you are doing it right. Take about 2-3 minutes for reps and full rest between sets
2-3x400m sub 60 with full rest. This is a great pre race workout. It can also be surprisingly tough mentally. Do 3 at pace and you should be able to break 2:00
Couple all of this work with your regular tempo and Vo2 sessions and you’ll break 2:00. I also reckon you are in about 55 400m shape, and not 60. You probably just haven’t figured out how to race it yet.